CN102221375A - Optical-fiber-circuit-based communication light source sensing system and method - Google Patents
Optical-fiber-circuit-based communication light source sensing system and method Download PDFInfo
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- CN102221375A CN102221375A CN 201110087076 CN201110087076A CN102221375A CN 102221375 A CN102221375 A CN 102221375A CN 201110087076 CN201110087076 CN 201110087076 CN 201110087076 A CN201110087076 A CN 201110087076A CN 102221375 A CN102221375 A CN 102221375A
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Abstract
The invention discloses an optical-fiber-circuit-based communication light source sensing method. Optical signals in an optical fiber are split through a first optical fiber processing assembly and are used for optical fiber sensing. Due to the conventional light source of a communication system, a part of optical signals in a communication optical fiber are split (coupled) by utilizing characteristics of an optical splitter and are used for realizing an optical fiber sensing function. Due to the characteristics of the optical splitter (at a low splitting ratio of less than 10 percent, namely on the premise of not influencing normal communication), the conventional light source in the system is utilized, an additional light source laser is not needed to be arranged, and the price of a common optical splitter is 10 percent or below of that of the light source; therefore, the cost of the system can be greatly reduced according to the scheme.
Description
Technical field
The present invention relates to a kind of optical fiber perimeter sensing technology, particularly realize the method and system of sensing based on the communication light source of fibre circuit.
Background technology
Present optical fiber perimeter sensor-based system all carries light emission module (light source), is injected in the sensor fibre, and the variation of transmitting the back parameter by measuring light is to realize Fibre Optical Sensor.
As shown in Figure 1, the general optical fiber sensor-based system has following structure:
Mainly comprise (1) light source laser instrument (2) sensor fibre (3) and survey receiving and analyzing system (4) optical processing assembly 2 (5) optical branching devices; The laser that the light source laser instrument sends arrives sensor fibre through two optical branching devices, arrives optical processing assembly 2 then, and light returns along former road, is detected the receiving and analyzing system and receives.
Summary of the invention
In order to solve above-mentioned deficiency, the objective of the invention is need not automatic light source, directly use the Communication ray signal in the circuit to realize Fibre Optical Sensor, a kind of method and system of realizing sensing based on the communication light source of fibre circuit is provided.
The technical scheme that adopts: a kind ofly realize the method for sensing based on the communication light source of fibre circuit, the first optical fiber processing assembly takes out the light signal branch in the optical fiber, is used for Fibre Optical Sensor.
The light signal that described branch takes out is less than 10% of fiber middle light signal.
The laser that described communication light source is sent becomes the two-way coherent source through the first optical fiber processing assembly, enters the isometric sensor fibre of two cores respectively, arrives the second optical processing assembly then, and light returns along former road, is detected receiver and receives.
This system comprises communication light source, first optical processing assembly, first optical branching device, sensor fibre, telecommunication optical fiber, second optical module and search receiner, wherein the first optical processing assembly communicates to connect with the search receiner and first optical branching device respectively, and first optical branching device is connected with the first optical processing component communication.
Described first optical processing assembly comprises two optical branching devices, and one of them optical branching device and another optical branching device, search receiner, first optical branching device communicate to connect.
Described first light optical processing assembly comprises an optical branching device and an optical circulator, and wherein said optical circulator and optical branching device, search receiner, first optical branching device communicate to connect.
Described second optical module is a light reflecting device.
Described light reflecting device comprises two faraday rotation mirrors.
Advantage of the present invention:
1. by the light source of existing communication system, utilize the characteristic of optical branching device, a part of light signal in the optical fiber communication is come out along separate routes, be used to realize the function of Fibre Optical Sensor.Characteristic by optical branching device (must be little splitting ratio, less than 10%, under the prerequisite that does not influence proper communication), utilize existing light source in the system, need not to increase extra light source laser instrument, and normal optical shunt price be the light source price below 10%, so this scheme can reduce the cost of system greatly.
2. utilize fiber optical circulator, substitute original optical branching device and (also claim: photo-coupler).To realize the distribution of luminous energy.Because the nonreversibility of fiber optical circulator port optical direction, effective isolation the influence of output port to the input port light source, thereby guarantee the life-span of laser instrument and the stability of fibre system.Fiber optical circulator has lower insertion loss, thereby has saved light resources, has improved the sensitivity of sensor-based system and has prolonged the protection distance of sensor fibre, has increased the optical fiber protective range, has improved the stability of system.
Description of drawings
In order to be illustrated more clearly in the technical scheme in the embodiment of the invention, the accompanying drawing of required use is done to introduce simply in will describing embodiment below, and apparently, the accompanying drawing in describing below only is some embodiments of the present invention.
The structural representation of Fig. 1 existing fiber sensor-based system;
Fig. 2 the present invention is based on the communication light source sensor-based system of fibre circuit--the structural representation of embodiment;
Fig. 3 the present invention is based on the communication light source sensor-based system of fibre circuit--the structural representation of another embodiment;
The structural representation of first optical processing assembly among Fig. 4 Fig. 3;
The structural representation of second optical processing assembly among Fig. 5 Fig. 2;
Fig. 6 realizes the theory diagram of optical fiber perimeter alarm according to the present invention.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, embodiment of the present invention is described further in detail below in conjunction with accompanying drawing.
Central idea of the present invention: get few part optical signals (can not influence original communication quality) in the telecommunication optical fiber by the optical branching device branch, be used for Fibre Optical Sensor.Not only do not influence the performance of communication, but also can utilize communications optical cable to monitor in real time as vibration transducer.
As shown in Figure 2, a kind of system that realizes sensing based on the communication light source of fibre circuit of one embodiment, this system comprises communication light source, first optical processing assembly, first optical branching device, sensor fibre, telecommunication optical fiber, second optical module and search receiner, as shown in Figure 5, the second optical processing assembly is a light reflecting device.Described light reflecting device comprises model: two faraday rotation mirrors of FM-31-2-L-1, finish the source reflection function; Finish and eliminate optical fiber polarisation decline function.The first optical processing assembly comprises two optical branching devices.Wherein the first optical fiber processing assembly optical branching device and another optical branching device, search receiner, first optical branching device communicate to connect.
The laser that communication light source is sent becomes the two-way coherent source through the first optical fiber processing assembly, enters the isometric sensor fibre of two cores respectively, arrives the second optical processing assembly then, and light returns along former road, is received device and detects.Wherein another optical branching device must be the splitting ratio less than 10%, does not so just influence proper communication.
As shown in Figure 3, another embodiment, a kind of system that realizes sensing based on the communication light source of fibre circuit, this system and above-mentioned embodiment shown in Figure 2 are basic identical, difference is that as shown in Figure 4, the first optical processing assembly comprises an optical branching device and optical circulator.Wherein the input port of optical circulator and an optical splitter communicate to connect, and output port and search receiner communicate to connect, optical circulator+optical branching device wherein, and model: the PI0C13T2S00+E type, finish communication light source beam split function; Finish the reverse isolation function of output light source and communication light source; Finish output light and receive the function that photosynthetic road enters the single optical fibre transmission; Finish the reduction optical power loss, improve the function of system sensitivity; Because the optical direction nonreversibility of each port of optical fiber circulator, can isolate the interfering with each other of light signal of output port and input port effectively.
As shown in Figure 6, the present invention is in the application of optical fiber perimeter early warning, the system of optical fiber perimeter early warning, the above-mentioned sensor-based system of realizing based on the communication light source of fibre circuit of this system, the detection receiving trap of this system is got rid of module with data collector, data analysis module, wrong report successively, triggers alarm module and interlink warning devices communicating and connects.Wherein light is detected and after receiver detects light signal is become electric signal, changes the back then and becomes data, is collected by capture card, after carrying out analyzing and processing by data analysis module, after satisfying alert if, trigger alarm module and send warning message, other panalarms simultaneously link.When occurring reporting to the police, relevant devices such as warning lamp, camera, warning signal, video recorder can link.
Wrong report is got rid of: wrong report is another important gordian technique that optical fiber sensing system need solve, because the sensitivity of interference-type optical fiber sensor-based system is high, small vibration can trigger warning, the problem that high sensitivity is brought is that some spontaneous phenomenons may cause wrong report, such as blow, rain, fence resonance that the machine roar causes etc. all can cause wrong report.It is the critical function of this sensor-based system that the identification of disturbing signal detects, and the core of alarm detection is to extract that all meet the signal of invading signal characteristic in the disturbing signal, and this class signal is shielded.For noise or do not possess the invasion feature signal, all should be by system filtration.The signal characteristic identification technique is a kind of mode identification technology, analyzes by the feature to varying input signal, these signals such as noise, invasion signal, vibration signal etc. are set up feature templates, live signal and template are compared,, reduce wrong report to determine the live signal type.Data analysis module and wrong report are got rid of module and can be integrated and also can be used as a module independently.
This system is applicable to inflammable and explosive and place such as strong electromagnetic, under the face of land fences such as the electrical network that can be laid in, iron skill, entanglement, fence, enclosure wall, also applicable and lawn, grit layer, floor tile, floor, cement flooring, normal soil.
The invention described above embodiment ordering is not represented the quality of embodiment just to description.
The above only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.The invention described above embodiment sequence number is not represented the quality of embodiment just to description.
Claims (8)
1. realize the method for sensing based on the communication light source of fibre circuit for one kind, it is characterized in that: this method is that the first optical fiber processing assembly takes out the light signal branch in the optical fiber, is used for Fibre Optical Sensor.
2. according to the method for claim 1, it is characterized in that: the light signal that described branch takes out is less than 10% of fiber middle light signal.
3. according to the method for claim 1 or 2, it is characterized in that: the laser that communication light source is sent becomes the two-way coherent source through the first optical fiber processing assembly, enter the isometric sensor fibre of two cores respectively, arrive the second optical processing assembly then, light returns along former road, is detected receiver and receives.
4. realize the system of the described method of claim 1, it is characterized in that: this system comprises communication light source, first optical processing assembly, first optical branching device, sensor fibre, telecommunication optical fiber, second optical module and search receiner, wherein the first optical processing assembly communicates to connect with the search receiner and first optical branching device respectively, and first optical branching device is connected with the first optical processing component communication.
5. system according to claim 4 is characterized in that: described first optical processing assembly comprises two optical branching devices, and one of them optical branching device and another optical branching device, search receiner, first optical branching device communicate to connect.
6. system according to claim 4 is characterized in that: described first light optical processing assembly comprises an optical branching device and an optical circulator, and wherein said optical circulator and optical branching device, search receiner, first optical branching device communicate to connect.
7. system according to claim 4 is characterized in that: described second optical module is a light reflecting device.
8. system according to claim 7 is characterized in that: described light reflecting device comprises two faraday rotation mirrors.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104008621A (en) * | 2014-06-03 | 2014-08-27 | 天津求实飞博科技有限公司 | Defense area type optical fiber disturbance periphery security and protection system and quick invasion disturbance judgment method |
| CN104408849A (en) * | 2014-12-23 | 2015-03-11 | 华南师范大学 | Door/window alarm equipment based on optical fiber sensing |
| CN106815957A (en) * | 2017-03-02 | 2017-06-09 | 北京汉科云端科技发展有限公司 | With the optical fiber perimeter intruding detection system that few core number optical cable is constituted |
| CN112002092A (en) * | 2020-08-07 | 2020-11-27 | 太原理工大学 | High-speed railway platform anti-border-crossing distributed optical fiber early warning system |
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| US4820016A (en) * | 1986-02-21 | 1989-04-11 | American Telephone And Telegraph Company, At&T Bell Laboratories | Waveguide-containing communications and sensing systems |
| JPH05241030A (en) * | 1992-02-27 | 1993-09-21 | Sumitomo Electric Ind Ltd | Distribution type optical fiber sensor |
| CN101258379A (en) * | 2005-08-01 | 2008-09-03 | 多摩-技术转让机关株式会社 | Optical fiber sensor connected with optical communication line |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5241030B2 (en) * | 2009-09-01 | 2013-07-17 | 富士フイルム株式会社 | Image transmission apparatus, method and program, image output apparatus, and image transmission system |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4820016A (en) * | 1986-02-21 | 1989-04-11 | American Telephone And Telegraph Company, At&T Bell Laboratories | Waveguide-containing communications and sensing systems |
| JPH05241030A (en) * | 1992-02-27 | 1993-09-21 | Sumitomo Electric Ind Ltd | Distribution type optical fiber sensor |
| CN101258379A (en) * | 2005-08-01 | 2008-09-03 | 多摩-技术转让机关株式会社 | Optical fiber sensor connected with optical communication line |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104008621A (en) * | 2014-06-03 | 2014-08-27 | 天津求实飞博科技有限公司 | Defense area type optical fiber disturbance periphery security and protection system and quick invasion disturbance judgment method |
| CN104408849A (en) * | 2014-12-23 | 2015-03-11 | 华南师范大学 | Door/window alarm equipment based on optical fiber sensing |
| CN104408849B (en) * | 2014-12-23 | 2017-02-22 | 华南师范大学 | Door/window alarm equipment based on optical fiber sensing |
| CN106815957A (en) * | 2017-03-02 | 2017-06-09 | 北京汉科云端科技发展有限公司 | With the optical fiber perimeter intruding detection system that few core number optical cable is constituted |
| CN112002092A (en) * | 2020-08-07 | 2020-11-27 | 太原理工大学 | High-speed railway platform anti-border-crossing distributed optical fiber early warning system |
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